Siemens MTX-H15 Operation, Switching On the Modem, Switching Off the Modem, Operating States/LED

MTX-H15 UMTS-HSDPA terminal modem http://www.matrix.es

4. OPERATION

4.1 Switching On the Modem

There is ONE way to switch on the modem, once power is applied:

• assert TURN_ON high for > 0.4s;

The modem is fully operational after 4 seconds. Logging onto a network may take longer than this and is outside the control of the modem.

The modem can be configured to start up at the time power is applied by permanently tying power connector signals TURN_ON (pin 4) and VCC (pin 1) together.

4.2 Switching Off the Modem

There are 2 ways to switch off (power down) the modem as described below:

• Either use the AT^SMSO command; RECOMMENDED.

The AT^SMSO command lets the MTX-H15 Terminal log off from the network and allows the software to enter into a secure state and safe data before disconnecting the power supply. The mode is referred to Power-down mode. In this mode only the RTC stays active.

•Or assert TURN_OFF, pin 3 of power supply connector, high for >1 seconds. A delay of up to 10s is experienced as the modem logs off the network.

4.3 Operating States/LED

The modem has a dual color LED, which displays the operating status of the Terminal. Both LEDS are provided for signalling the module’s network connectivity status -STATUS0 to signal the GSM connectivity and STATUS1 to signal the UMTS connectivity.

This status function has to be activated with AT^SLED=1

In following table is showed the different operating status of the LEDS:

GREEN LED connected to STATUS0 line:

•Lights steadily when the ME is registered to the GSM network and either awake or in power saving state.

•Flashes at 1Hz and 50% duty cycle (0.5s on, 0.5s off) when the ME is awake and not registered to any network.

•Flashes at 0.25 Hz and appr. 50% duty cycle (2s on, 2s off) when the ME is in power saving state and not registered to any network.

When the ME is in power saving state and not registered, the flashing frequency may be less than 0.25Hz and the duty cycle may vary, for example between 45% and 55%. These variations are due to transitions from awake state to power saving state which may occur at the beginning of an LED flashing period (eg. at the beginning of a 1Hz or 0.25Hz flashing period). In the worst case, the LED will indicate a transition from awake to power saving after 4s.

•While the STATUS0 signal is active the STATUS1 signal is inactive.

YELLOW LED connected to STATUS1 line: (version 1 RED Colour Led))

•Lights steadily when the ME is registered to the UMTS network.

•Is off when the ME is not registered to the UMTS network.

•While the STATUS1 signal is active the STATUS0 signal is inactive.

MTX-H15 User Manual V.2.0Pag. 19 Preliminary. Subject to change without prior notice